pass callback argument by reference

[wyfo]

based on #1828

[github-actions]

PR missing one of the required labels: {'enhancement', 'internal', 'dependencies', 'new feature', 'documentation', 'breaking-change', 'bug'}

[github-actions]

PR missing one of the required labels: {'internal', 'bug', 'new feature', 'enhancement', 'documentation', 'breaking-change', 'dependencies'}

[github-actions]

PR missing one of the required labels: {'dependencies', 'bug', 'new feature', 'breaking-change', 'enhancement', 'internal', 'documentation'}

[codecov]

Codecov Report

Attention: Patch coverage is 89.00709% with 31 lines in your changes missing coverage. Please review.

Project coverage is 71.18%. Comparing base (1a10597) to head (4ffcbd3).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
zenoh-ext/src/advanced_subscriber.rs	0.00%	5 Missing ⚠️
zenoh/src/api/session.rs	95.65%	4 Missing ⚠️
io/zenoh-transport/src/common/pipeline.rs	75.00%	3 Missing ⚠️
zenoh/src/api/handlers/callback.rs	82.35%	3 Missing ⚠️
zenoh/src/api/matching.rs	0.00%	3 Missing ⚠️
zenoh/src/api/query.rs	0.00%	3 Missing ⚠️
zenoh/src/api/queryable.rs	0.00%	3 Missing ⚠️
zenoh/src/api/scouting.rs	0.00%	3 Missing ⚠️
zenoh-ext/src/querying_subscriber.rs	0.00%	2 Missing ⚠️
zenoh/src/api/handlers/fifo.rs	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1857      +/-   ##
==========================================
- Coverage   71.18%   71.18%   -0.01%     
==========================================
  Files         364      364              
  Lines       65647    65551      -96     
==========================================
- Hits        46733    46662      -71     
+ Misses      18914    18889      -25     

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